For water quality i use indian almond leaves.
Wow I know IAL is good but I never knew it improves water quality, Water quality is not about the things you add to the tank but of course you know that.
Freeze dried anything is rubbish and I wouldnt feed it to my fish.Nutrition i provide them mosquito larvae and freeze dried bloodworms.
Now i got about you and colin but not sure about nickAu
I will be honest and very blunt here, you like Colins advice because he agrees with your fish keeping habits and encourages you to do stuff even if its wrong, I on the other hand do not agree with your fish keeping habits so you don't like and disregard my advice.